Eichaed thompson



(No Mode.

B. THOMPSON.

DAMPER REGULATOR.

Patented July 29, 18 84.

RICHARD THOMPSON, OF NEWV YORK, ASSIGNOR TO GEORGE H. CLARKE,

OF BROOKLYN, N Y.

DAMPER-REGULATOR' .SPECIFICATION forming part of Letters Patent No.302,692, dated July 29, 188%.

Application filed November 10, 1883.

fo (LZZ whom it may concew:

Be it known that I, RICHARD THoMPsoN, a citizen of the United States,and a resident of New York, County and State of New York,` haveinventeda new and useful Improvement in Dampcr-Regulators, of which thefollowing is a specification.

This invention 'elates to that class of damper-regulators in which themovement of the dainper is controlled by means of a piston in a cylinderactuated by the variations of the steam-pressure in the boiler. It isfound in the application of this class of clamperiegulators, to givegood results, that the resistance of the piston offered to the steamacting on it shall be Variable, and this result has heretofore beenacconplished by means of adjustable weiglts or springs. Now, my presentinvention enbraces simple and effective means for this purpose whichconsist in pro viding the upper end of the cylinder with a cock whichadmits air to the top of the piston, said cock being actuated by a guidecarried by one of the side bars connected to the piston-rod, so that itsopening is reduced as the piston rses, thus offering an increasedresistance thereto by reason of the confined air in the cylinder havinga gradually-decreasing aperture to escape from. `This guide isadjustably connected to the side bar both as regards the position of thepiston when it commences to close the cock and as regards the eXtent thecock is closed by it. bility of the resistance offered to the piston Ihave found in practice of great advantage, as no two danpers require thesame adjustment of the regulator to cause them to operate properly.

Figure l is a front elevation of a daiperregulator embodying myimprovements thereon. Fig. 2 shows a part of the same enlarged andpartly in section. Fig. 3 is an enlarged 'View of the upper part of thecylinder and adjustable cock. Fig. 4 is a transverse section cut throughthe line 3 y, enlarged. Fig. 5 is a transverse section cut through theline z z, enlarged. Fig. G shows a side elevation of a modification; andFig. 7 is a plan of the same, partly in section.

a reprcsents the cylinder; a', the pipe connecting the lower part of thesame to the boil-- This adj usta- (No model.)

er; b, the pisten; b', the piston-:rodg b the c'osshcad; c and c', sidebars supporting the weight d. which is so proportioned as tocounterbalance the energy of the steam acting against the under side ofthe piston at the maximum pressure at which it is desired to use thestean; e, a chain or ropeconnected to the cross-head b and segment f ofthe damper f, located in the flue g.

The cylinder a is provided with a cap, through which the piston-rod b'passes. A stuffingbox is not a necessity here, as the quantity ol" airwhich will escape around the piston-rod, if it is a good sliding fit inthe cap, will not materially affeet the propenworking of the apparatus.

The regulating-cock 72 is fastened in the cylinder just above thehighest point the piston ever reaches. This cock has its dischargenozzledownward, so that any water that niay accumulate above the piston isfreely discharged therefron, and a small pipe may be attached thereto tocarry such water below the bottom of the cylinder, if desired, to avoidsoiling the outside of the same.

To the plug of' the cock IL is Secured by means of a set-screw the leveror arm i, having at its upper end a projecting pin or roller adaptcd to'bear against the side bar c, or the spring-guide j, carried thereby,this roller or pin being held thereto by means of the spring h on theend of the plug of the cock h. The length of the guide j is abouttwo-thirds of the distance through which the 'piston is designed tomove, as it is generally found better to offer no other resistance` thanthe counterweight d to the movement of the piston during the first partof its travel. This guide j is a flat straight spring bent at its lowerend, through which a *bolt passes to secure it to an offset slotted armforming part of the collar k, secured to the side bar c. The upper endof the guide j bears against the side bar c. It may be bent to restagainst the' rear side of the side bar to assist in holding it in place.

The normal position of the parts with the damper open is shown at Fig.1, the plug of the cock h being set in relation to 'the lever i by meansof the set-screw which connects them according to the speed at which itis desired the air shall escape from the cylinder IOO 4 leaving thecylinder.

during the first part of the movement of the piston. When the roller orpin on the lever 72 is struek by the guide j, it rides along the outerface of the same, and so gradually closes the cock, thus offering agradually-increasing resistance to the movement of the piston. TheeXtent of` this gradual closing of the cock is governed by theinclination given to the guide j, which is provided for by the slot inthe offset-arm of the collar Ic,- but in no* case should i the cock becaused to entirelyprevent the air I In some cases it may be desirable toremove all opposing resistance to the downward movement of the piston.This I provide :for by setting the guide jsufficiently high, so that theroller on the arm i of the cock shall pass beyond the end of the guidewhen the piston is in its highest position. The cock is then opened byits spring h', and the roller on the arm comes in contact with and rollsalong the side bar c as the piston descends, and forces the upper end ofthe guide j away from the side bar'c, as shown at Fig. 3, which, byreason of its flexibility, again comes in contact with the side bar cwhen the roller passes.

- The limit of theupward position assumed by with a set of cone-pulleys,n.

the piston is governed by means of the adjustable collar-stopsc c' onthe side bars, c c'.

ln the modification shown at Figs. 6 and 7, m represents the plug of ascrew-cock, located at the upper end of the cylinder, and provided Acord, 0, fastcned at its upper and lower end's to the side bar c, ispassed around one of the pu1leys,according to the amount of variationthe passage of the cock is to have for a full stroke of the piston, andthe size of the opening when the piston is in its lowest position may bereadily fixed by turning the screw-plug so that the pulley slips in thecord.

What I claim, and desire to secure by Letters Patent, is V l 1. Thecombination,with a cylinder damperregulator, of an air-cock and means,substantially as described, connected to and controlled 4 5 by thepiston moving in the cylinder, and adapted to gradually partly close thecock, a's set forth;

2. An air-cock attached to the cylinder of a damper-regulatonineonbination with an inclined guide on a bar secnred to the pistonworking in the cylinder, substantially as and for the purpose 'setforth.

3. In a cylinder damper-regulator, a flexible inclined guide on a barsecured to the piston, in combination with an air-cock provided with anarm attached to the cylinder, wher'eby the cock is gradually and partlyclosedas the piston ascends and open when it descends, substantially asand for the purpose set forth.

4. An inclined guide on a bar Secured to the piston adjustable inrelation tlereto and as to its inclination, in combination with anaircock provided with an arm and attachcd to the cylinder, substantiallyas and for the purpose set forth. i i

5. In combination, the cylinder a, cock h, having arm t', pistonb, rodc, and guide j, substantially as and for the purpose set forth.

6. The flexible guide j, collar lgwith slotted offset-arn, and rod c,connected to and car ried by the piston b, in con'bination with aircockh, arm i, and cylinder a, substantially as XVitnesses: v

H. D. WILLIAMs, ALFRED SHEDLOCK.

